Encoding algorithm: The role of encoding, one is to use a certain format to record digital data, and the other is to use a certain algorithm to compress digital data to reduce storage space and improve transmission efficiency. The compression algorithm includes lossy compression and lossless compression. Lossy compression means that the data cannot be completely recovered after decompression, and some information is lost. One of the basic indicators of compression coding is the compression ratio, which is usually less than 1. The more compression, the more information is lost, and the more distortion is after signal reduction.
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